Subtract 42/45 from 1/28
1/28 - 42/45 is -377/420.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 28 and 45 is 1260
Next, find the equivalent fraction of both fractional numbers with denominator 1260 - For the 1st fraction, since 28 × 45 = 1260,
1/28 = 1 × 45/28 × 45 = 45/1260 - Likewise, for the 2nd fraction, since 45 × 28 = 1260,
42/45 = 42 × 28/45 × 28 = 1176/1260 - Subtract the two like fractions:
45/1260 - 1176/1260 = 45 - 1176/1260 = -1131/1260 - After reducing the fraction, the answer is -377/420
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 2/28-42/45 1/28-84/45 1/56-42/45 1/28-42/90 3/28-42/45 1/84-42/45 5/28-42/45 7/28-42/45